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Although I can see bipedalism in the smaller
(earlier) pterosaurs, I also have difficulty seeing them as bipeds in their much
larger forms. Especially with partially folded wings. Even minor gusts would
have made a bipedal stance fairly unstable. Then again, the relatively long
metatarsals don`t seem appropriate for a strictly plantigrade stance either.
Perhaps they (the larger forms) were capable of both modes, and went
digitigrade when sprinting for a takeoff? In a forward momentum, the apparently
overweighted front end would not be a problem.
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